Effects of fluorine on the growth of Chinese cabbage (Brassica campestris L.) and oilseed rape (Brassica napus L.) at seedling stage

摘要

ABSTRACT To evaluate the impact of F in soil on seed germination, growth performance and biochemical parameters of Chinese cabbage (Brassica campestris L.) and oilseed rape (Brassica napus L.), a pot experiment was conducted by amending soil with 0, 200, 400, 600, 800 and 1000 mg F kg−1 spiked soil. During aging of exogenous F in soil, an increase in the soil pH and concentrations of all F fractions was noted at elevated F concentrations. Fluorine in the soil was mainly found in the residual fraction (88 and 86). The results of pot experiment revealed that the percentages of seed germination rate, chlorophylls concentration, and the dry biomass of Chinese cabbage and oilseed rape decreased by 31, 23, 16, and 24, 38, 31, respectively, as compared with their respective controls. The free proline concentration increased by 40 for Chinese cabbage and by 151 for oilseed rape. It was observed that F mainly accumulated in the roots of both plants, and the bioaccumulation factor and translocation factor remained <1. This study showed more remarkable effects of F on oilseed rape than those on Chinese cabbage.